5 Common Furnace Problems and How to Fix Them

Most Utah homes are heated with traditional forced-air furnaces. If your system is giving you trouble this winter, you could end up with higher-than-normal energy bills or a chilly house. Find out more about the five most common furnace problems so you can get the heat working again.

1. The Furnace Produces No Heat
   Before you get too worried, make sure the thermostat is set to “heat” and the target temperature is higher than the current temperature in the room. Try turning up the thermostat a few degrees to see if the furnace kicks on.If not, check the circuit breaker box for a tripped breaker and reset any you find. If there’s still no heat, the pilot light may be out, requiring you to relight it. Newer furnaces use an electric ignition system, which may be faulty if the furnace is not producing heat. In this case, you’ll need to schedule furnace repair.
2. The Furnace Doesn’t Produce Enough Heat
   First, replace the filter. Then, check that all supply and return registers are clean and unblocked to ensure adequate airflow. If these fixes don’t work, the problem is likely due to dirty gas burners, which require professional adjustment.
3. The Furnace Runs Constantly
   Change the thermostat setting from “on” to “auto.” This tells the blower to only run when the burners are lit. If the fan continues running, turn down the temperature to see if that makes a difference. If not, your furnace could have a faulty limit control switch, which only a professional should repair.
4. The Furnace Cycles On and Off Repeatedly
   Check the air filter and replace it if dirty. Next, try applying lightweight oil to the blower motor lubrication ports. While you’re at it, check the blower belt for proper tension, and call a technician to tighten or replace it if needed.If the short-cycling furnace problem continues, the heat anticipator in the thermostat may be acting up. Seek a professional’s help to perform the necessary furnace repair.
5. The Furnace Runs Loudly
   Noisy operation can indicate several problems. For high-pitched squealing, check the blower belt and lubricate the blower motor. Rattling sounds could point to a loose panel, which is easy to tighten. To fix rumbling sounds when the burners are off, adjust the pilot light. For rumbling sounds when the burners are lit, hire a professional to clean the burners. Grinding noises could mean the motor bearings are shot, so turn off the furnace and call a technician right away.

If you still need help after trying to fix common furnace problems yourself, turn to Parley’s PPM Plumbing, Heating & Cooling. We have over 40 years of experience providing reliable furnace installation, replacement, and repair. With fully vetted, background-checked technicians, you can trust us to get the job done right the first time around. To schedule services, please call 801-226-3033 if you live in Utah County, or reach us at 801-229-2665 if you’re a Salt Lake County resident. You can also contact us online with any questions you have.